Enterprise

Community Forums Switches

OSPF. Unsolicited /32 pre...

OSPF. Unsolicited /32 prefixes on directly connected interfaces

Created: Feb 19, 2019 09:42:55Latest reply: Feb 22, 2019 02:18:26 256 3 0 0

Rewarded Hi-coins： 0 (problem resolved)

display all floors ^#1

HI here!

I'm configuring OSPF on my s6720 switch. It works, but it looks strange. I just turned OSPF on the interface, like this:

ospf 1 router-id 10.8.0.100

silent-interface all

undo silent-interface Vlanif4010

area 0.0.0.0

network 10.8.3.0 0.0.0.255

interface Vlanif4010

ip address 10.8.3.18 255.255.255.0

ospf cost 100

ospf network-type p2mp

ospf dr-priority 0

mpls

mpls ldp

As you can see, all the neigbours have addresses in 10.8.3.0/24 network.

Then it started to discover the neighbours, and exchanged the routing info. Finally I checked my RIB and found a lot of prefixes like this: 10.8.3.XX/32

Why the OSPF process generates /32 for directly connected interface. It isn't a Loopback interface, just usual vlan with broadcast network there.

I tried to change network type, but it didn't change the behaviour. Probaly it could be connected with MPLS on the interface, who knows?

Any way, could you give me a hint how i could change this behaviour? I applied a prefix list to filter these prefixes, but I don't think this is a good resolution of the problem.

x
convention：

I have this problem too (0) Favorite(0) Report

Featured Answers

Scott_Qing Created Feb 21, 2019 06:26:13

in p2mp network, ospf will create a host route for each neighbor, that is what you said 10.8.3.x/32 routes.

x
convention：

All Answers

sim_157 Created Feb 20, 2019 06:48:41

can you provide more details about your network topology and the routing-table?

x
convention：

Scott_Qing Created Feb 21, 2019 06:26:13

in p2mp network, ospf will create a host route for each neighbor, that is what you said 10.8.3.x/32 routes.

x
convention：

chenhui Admin Created Feb 22, 2019 02:18:26

as @Scott_Qing said, in p2mp network, ospf will generate host routes for ospf neighbors,

x
convention：

Comment

Notice

Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:

Politically sensitive content
Content concerning pornography, gambling, and drug abuse
Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy

Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " Privacy."